Nanomaterials
·
2024
·Vol. 14
·期 22
·1772
·
IF 4.4
Junqi He,Jing Lv,Yanan Li,Wenfang Zheng,Renming Pan
To enhance the ignition and combustion characteristics of boron (B), in this study, a suitable, energetic fluorinated group (NF2) that can improve energy and promote combustion efficiency was utilized and B/NF2composites (B/PDB) with three different particle sizes (10–20 μm, <5 μm, and 0.5–2 μm) were prepared through energetic fluorinated surface modifications with a PDB layer, a copolymer of difluoroaminomethyl-3-methylethoxybutane and 3,3′-bis(azidomethyl)oxetane, coated on the surface of B. The morphology and structure of B/PDB were characterized via the FTIR, SEM, TEM, and XPS techniques. The results indicate that all B/PDB particle sizes were successfully coated by NF2on the surfaces of B particles through the PDB layer. The TG curves in the thermal analyses were used to determine the amount of the PDB layer of B/PDB with different particle sizes. Based on the DSC curves, NF2of composites with better catalysis during ammonium perchlorate (AP) decomposition. Additionally, the effects of NF2on both B/PDB and B/PDB with AP were investigated through PY-GC/MS, ignition, and combustion. Compared with pure B, NF2significantly improved the thermal conductivity, thereby decreasing the ignition delay of B/PDB, and the ignition delay of B/PDB with AP. The combustion of B/PDB and AP was more intense, extending the combustion duration, forming volatile fluorine compounds, and increasing combustion reaction efficiency. In general, this energetic fluorinated-centred surface modification has potential applications to enhance the ignition and combustion characteristics in B.
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高影响因子
NEW CARBON MATERIALS
·
2025
·
IF 6.8
Yan-bing YUAN,Zong-bin ZHAO,Hong-hui BI,Run-meng ZHANG,Xu-zhen WANG,Jie-shan QIU
For rechargeable aqueous zinc-ion batteries (ZIBs), the design of nanocomposites comprised of electrochemically active materials and carbon materials with novel structures has great promise in addressing the issue of electrical conductivity and structural stability in the electrode materials during electrochemical cycling. We report the production of a novel flexible electrode material, by anchoring MnO 2 nanosheets on a B,N co-doped carbon nanotube array (BNCNTs) grown on carbon cloth (BNCNTs@MnO 2 ), which was fabricated by in-situ pyrolysis and hydrothermal growth. The generated BNCNTs were strongly bonded to the surface of the carbon fibers in the carbon cloth which provides both excellent electron transport and ion diffusion, and improves the stability and durability of the cathode. Importantly, the BNCNTs offer more active sites for the hydrothermal growth of MnO 2 , ensuring a uniform distribution. Electrochemical tests show that BNCNTs@MnO 2 delivers a high specific capacity of 310.7 mAh g −1 at 0.1 A g −1 , along with excellent rate capability and outstanding cycling stability, with a 79.7% capacity retention after 8000 cycles at 3 A g −1 . Download: Download high-res image (181KB) Download: Download full-size image
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Miao Wang,Feixiang Ding,Yuren Zhao,Ge Xu
Conventional graphitic carbon nitride (g-C3N4) suffers from rapid complexation of photogenerated charge carriers and limited visible-light absorption. To address these issues, this study aims to construct an intramolecular donor–acceptor system within g-C3N4 to precisely modulate its electronic structure and enhance photocatalytic performance. A novel carbon nitride-based composite photocatalyst (CN-abIM9mg) was synthesized via a two-step thermal condensation method using 2-aminobenzimidazole (abIM) as a dopant. The ultratrace doped donor provides an electron transfer mode requiring lower energy, which narrows the band gap of g-C3N4 from 2.79 eV to 2.70 eV and expands the absorption capability to visible light. Furthermore, CN-abIM9mg has a specific surface area of 112.215 m2 g−1, which is 3.5 times higher than that of g-C3N4 (32.156 m2 g−1), supplying more photocatalytic active sites. A possible mechanism was proposed based on characterization using X-ray photoelectron spectroscopy, UV-vis diffuse reflectance spectroscopy, and density functional theory simulation calculations. In addition to the π–π* transition originating from the pristine g-C3N4, the occurrence of n–π* electronic transition within the donor–acceptor system enhanced the delocalization ability of the photogenerated charge carriers. The synergistic effects of improved light absorption, efficient charge separation, and increased surface area endow CN-abIM9mg with high photocatalytic activity, leading to a 98.8% degradation rate for Rhodamine B under visible light, with a reaction rate constant 4.9 times that of pure g-C3N4. This work provides profound molecular-level insights into enhancing photocatalytic activity through n–π* transition promotion in donor–acceptor-structured polymers.
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高影响因子
BIOFACTORS
·
2019
·Vol. 45
·期 6
·950-958
·
IF 3.598
Haihua Zhang,Qiumei Shi,Weixiao Nan,Yaqi Wang,Shiyong Wang,Fuhe Yang,Guangyu Li
The regeneration of proliferation potential of dermal papilla (DP) cells contributes to the treatment of hair loss disorders. Ginkgolide B (GKB) and bilobalide (BB) are two functional components isolated from Ginkgo biloba that can promote hair growth. In the current study, the effect of GKB or BB on DP cell viability and the related signaling was assessed. Hair follicles were isolated from minks, and the growth of hair follicles was measured under the administration of GKB or BB. DP cells isolated from minks were also subjected to GKB or BB. The administration of GKB or BB induced the growth of hair follicles. The viability of DP cells was also increased by GKB or BB as illustrated by methyl thiazolyl tetrazolium and flow cytometry detection. Moreover, the secretion of VEGF was enhanced by GKB or BB. At molecular level, the activities of Akt, ERK1/2, and β-catenin were induced by GKB, whereas BB only increased the activities of Akt and β-catenin. In conclusion, although the two components influenced the β-catenin signaling activity in distinct mechanisms, they both increased the viability of DP cells and promoted the cycle of hair follicles.
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高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Qing Zhu,Nan Lan,Weikang Xu,Yifan Liu,Qiao Wang,Yiting Cao,Hong Deng,Xueming Liu,Yuan Liu
Addressing the formidable challenge of treating significant quantities of organic dyes and heavy metal chromium in tannery wastewater, this study synthesized a novel Z-scheme La-MOF/BiOBr composite heterojunction photocatalyst via the hydrothermal method and established an efficient visible-light photocatalytic system. To comprehensively evaluate the photocatalytic redox activity, rhodamine B (RhB) and heavy metal Cr(VI) were selected as target pollutants. Kinetic analysis revealed that the optimal LM-BB-50 catalyst achieved over 99 % degradation of RhB and Cr(VI) within 15 min illumination, indicating the remarkable enhancement of Z-scheme heterojunction in photocatalytic oxidation and reduction efficiency. Based on various photoelectric analysis techniques, it was elucidated that the superior activity of the Z-scheme heterojunction originated from the modulation of the band structure upon La-MOF and BiOBr integration, significantly improving visible light absorption, electron-hole pair separation efficiency, and endowing the energy band with robust redox capabilities. Free radical capture and quenching experiments confirmed that photogenerated holes and superoxide radicals played a crucial role in RhB oxidation , while photogenerated electrons were the primary active species for Cr(VI) reduction.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Dan Lin,Lingfei Li,Xin Song,Shihao Xu,Qianru Zhang,Zhong Hu,Liang Yang,Changlong Jiang
The present work reports a fluorescent sensor by utilizing a composite Rhodamine B-Ag@Au nanoprobe for the visual and semi-quantitative assay of organophosphorus pesticide (OP) residues via a “light up” sensing phenomenon. Core–shell structured Ag@Au NPs can directly quench the orange fluorescence of Rhodamine B (RB) at 580 nm based on Förster resonance energy transfer. Due to the stronger coordination ability of Ag@Au NPs with OPs, OP residues can displace RB from the surface of Ag@Au NP; thus, the RB fluorescence can effectively recover. Under optimum conditions, the composite fluorescent nanoprobe shows sensitive responses to OP residues in the range of 0.001–0.4 μM with a sensitive detection limit (LOD) of 7.89 nM. Moreover, combined with the smartphone color recognizer application (APP), the ratio of fluorescence intensity response is recorded on the green channel (G)/red channel (R), which has been employed for visual quantitative determination of OPs with an LOD of 16.3 nM. This proposed light up fluorescent sensor is also applied to OP residue identification in real water and agricultural samples with highly promising performance. The method reported here provides a convenient pathway for rapid and visual detection of pesticide residues utilizing organic composite nanomaterials.
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高影响因子
Evidence-based Complementary and Alternative Medicine
·
2021
·Vol. 2021
·期 1
·9962007
·
IF 2.63
Zhenzhuo Li,Rui Jiang,Jianzeng Liu,Xiaohao Xu,Liwei Sun,Daqing Zhao
Here, we evaluated the in vivo skin-protective effects of topical applications of Panax ginseng C. A. Meyer extract (PG2) and its phenolic acid- (PA-) based components against UVB-induced skin photoaging. PG2 or PA applied to skin of hairless mice after UVB-irradiation alleviated UVB-induced effects observed in untreated skin, such as increased transepidermal water loss (TEWL), increased epidermal thickness, and decreased stratum corneum water content without affecting body weight. Moreover, PG2 and PA treatments countered reduced mRNA-level expression of genes encoding filaggrin (FLG), transglutaminase-1 (TGM1), and hyaluronan synthases (HAS1, HAS2, and HAS3) caused by UVB exposure and reduced UVB-induced collagen fiber degradation by inhibiting the expression of matrix metalloproteinase genes encoding MMP-1, MMP-2, and MMP-9. Meanwhile, topical treatments reduced cyclooxygenase-2 (COX-2) mRNA-level expression in photodamaged skin, leading to the inhibition of interleukin-1 β (IL-1 β ) and interleukin-6 (IL-6) mRNA-level expression. Thus, ginseng phenolic acid-based preparations have potential value as topical treatments to protect skin against UVB-induced photoaging.
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 51
·45864-45872
·
IF 3.289
Yafei Wang,Jiang Fan,Tianyi Li,Qiong Wang,Junwei Shi,Zuoming Qu,Hua Tan,Yu Liu,Weiguo Zhu
Two binuclear platinum metallomesogens possessing a 6,12-dihydro-indeno[1,2-b]fluorene bridge, FJ-1 and FJ-2, have been synthesised and characterised by 1H and 13C NMR, TOF-MS and elemental analysis. Their thermal properties were studied by polarised optical microscopy and differential scanning calorimetry. Upon photoexcitation in solution, both complexes exhibited dual fluorescence (1π–π*)/phosphorescence (3π–π*) emission covering most of the visible spectrum (from about 460 nm to 750 nm). This uncommon behaviour has been further investigated by time-resolved optical spectroscopy, including nanosecond time-resolved transient absorption spectroscopy, and further insights were obtained by means of density functional theory (DFT) and time-dependent DFT (TD-DFT). An organic light-emitting diode (OLED) using FJ-1 was prepared. Importantly the two emission bands are retained in electroluminescence. This result suggests that controlling spin–orbit coupling to obtain dual emission can provide an effective way of achieving broadband emission based on a single molecule.
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高影响因子
Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 18
·4614-4623
·
IF 7.779
Feixiang Wang,Yun Yang,Congcong Jin,Shilie Pan
A new borate, Li6.58Na7.43Sr4(B9O18)(B12O24)Cl (LNSBOC), was successfully obtained via a spontaneous crystallization method in an open system. LNSBOC crystallizes in a hexagonal crystal system with the centrosymmetric space group of P63/m, with a = 9.3046(2) Å, c = 24.3239(7) Å and Z = 2. According to the statistics, the structure of LNSBOC is extraordinary not only because of the discovery of the novel fan-like fundamental building block B9O18, but also for the unprecedented coexistence of the largest two highly polymerized (number of B atoms more than six) isolated B–O clusters in the structure. A discussion about the cause of the rareness of borates containing two polymerized isolated B–O clusters was carried out by investigating previous research and extant compounds. Even more significantly, a strategy to design compounds/crystal structures containing two polymerized isolated B–O clusters is put forward in this work from the viewpoint of structures and elements. In addition, thermal analysis and infrared and UV–Vis–NIR diffuse reflectance spectroscopy were performed for the title compound.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Rengang Shi,Shengkai Zhu,Raz Muhammad,Tao Zhou,Bing Liu,Minmin Mao,Dawei Wang,Kaixin Song
In this work, spinel-structured MgAl 2- x (Zn 0.5 Mn 0.5 ) x O 4 (0 ≤ x ≤ 0.08) single-phase ceramics were prepared through a solid-state reaction route. The substitution of (Zn 0.5 Mn 0.5 ) 3+ for Al 3+ at the octahedral site affected the degree of inversion of A/B lattice sites, bond length/strength/valence, and covalency of metal-oxygen bond in the tetrahedron and hence microwave dielectric properties of MgAl 2 O 4 . The variation in ε r and tanδ of ceramics is investigated in the millimeter wave-terahertz frequency band by combining infrared reflection spectrum and terahertz time-domain spectroscopy. A high Q × f value of 111,010 GHz @ 12.01 GHz, low ε r = 8.3, and slightly lower τ f = −60 ppm/°C is obtained for MgAl 1.98 Zn 0.01 Mn 0.01 O 4 ceramics, which is tuned by adding a small amount of SrTiO 3 . The composite ceramics exhibited a near-zero τ f (2.8 ppm/°C), high Q × f (55,400 GHz @ 11.15 GHz), and low ε r (= 8.5), showing a great potential application prospect for 5G/6G wireless communication.
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高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Liping Zhang,Guohong Wang,Zhenzhong Xiong,Hua Tang,Chuanjia Jiang
A combined hydrothermal-calcination approach is developed to synthesize hierarchical β -Bi 2 O 3 /g-C 3 N 4 direct Z-scheme photocatalyst with enhanced visible light photoactivity for Rhodamine B (RhB) degradation. First, Bi 2 O 2 CO 3 microflowers were hydrothermally prepared using Bi(NO 3 ) 3 ·5H 2 O as feedstocks, and then a series of β -Bi 2 O 3 /g-C 3 N 4 direct Z-scheme photocatalysts were synthesized via a facile calcination method using Bi 2 O 2 CO 3 and g-C 3 N 4 as precursors. The samples were systematically characterized by various characterization technologies including X-ray diffraction, scanning and transmission electron microscopes, Fourier transform infrared spectroscopy and N 2 absorption-desorption equipment. It was found that the g-C 3 N 4 content in the precursors played a key role in affecting the photocatalytic activity of the final products. The β -Bi 2 O 3 /g-C 3 N 4 heterojunction exhibited higher photocatalytic activity than single active components ( β -Bi 2 O 3 and g-C 3 N 4 ), indicating the presence of a synergistic effect between two active components in β -Bi 2 O 3 /g-C 3 N 4 heterojunction. Among all as-prepared catalysts, the 70 wt.% g-C 3 N 4 /Bi 2 O 2 CO 3 exhibits the highest activity for RhB degradation, and the apparent reaction rate constant k (42.2 × 10 −3 min −1 ) is 3.1 and 1.7 times as high as that of pure β -Bi 2 O 3 (13.5 × 10 −3 min −1 ) and g-C 3 N 4 (25.2 × 10 −3 min −1 ), respectively. The enhanced photocatalytic performance of β -Bi 2 O 3 /g-C 3 N 4 heterostructure photocatalysts is mainly due to the high surface area, closely contacted interfaces between the β -Bi 2 O 3 and g-C 3 N 4 component, and the formation of direct Z-scheme structure in the β -Bi 2 O 3 /g-C 3 N 4 composites.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Li Zhang,Yiwen Zhao,Yuwei Wu,Yanping Jiang,Qianwei Wang,Xinyi Lin,Gang Song,Kunlun Huang,Zhiyi Yao
Antibiotic residue in food products has aroused considerable public concerns all over the world. It is of great significance to develop an efficient approach for rapid detection of antibiotics in food. In this work, a selective and sensitive method for detecting Polymyxins B (PMB) was established in 100 % aqueous media based on the supramolecular aggregates of water-soluble perylene diimide (PDI) derivative. We have designed and synthesized a series of PDI derivatives (PDI-1, 2, 3, 4, Scheme 1). The sensing performance and mechanism of PDI-based probes werestudied by absorption, emission, and circular dichroism (CD) techniques. It was found that the formation of the supramolecular aggregate driven by the non-covalent interactions between PMB and PDIs accounted for the fluorescence quenching of PDIs. PDI-1 was screened to be the most effective probe, which has the characteristics of detecting PMB rapidly and intuitively in both solution state and solid support. The detection limit can be extended to be 18.5 nmol/L by the aid of fluorometry. PDI-1 can also be used for the determination of PMB in practical samples with high sensitivity and large operative range. To the best of our knowledge, this work is the first example of fluorescent sensing PMB based on organic molecular probes in 100 % aqueous media.
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